Water filled barbell



FIG. 1 is a front elevational view of a water filled barbell, the rear elevational view being a mirror image of the front view.

FIG. 2 is a top plan view thereof.

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image of the left side view. 

The ornamental design for a water filled barbell, as shown and described. 